function Card(rank, face, orientation, imageFileName) {
	this.rank = rank;
	this.face = face;
	this.imageFileName = imageFileName;
	this.orientation = orientation;
	this.pile = null;
}
Card.faceUp = 0;
Card.faceDown = 1;
Card.orientation = {
	north : 0,
	south : 1,
	east : 2,
	west : 3,
	none : 4
};